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Subject[tip: x86/entry] x86/entry/64: Move do_softirq_own_stack() to C
The following commit has been merged into the x86/entry branch of tip:

Commit-ID: 4f41db23ef2593aec26e23e7f4bacc620e82f545
Gitweb: https://git.kernel.org/tip/4f41db23ef2593aec26e23e7f4bacc620e82f545
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Thu, 21 May 2020 22:05:24 +02:00
Committer: Ingo Molnar <mingo@kernel.org>
CommitterDate: Tue, 26 May 2020 19:06:27 +02:00

x86/entry/64: Move do_softirq_own_stack() to C

The first step to get rid of the ENTER/LEAVE_IRQ_STACK ASM macro maze. Use
the new C code helpers to move do_softirq_own_stack() out of ASM code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20200521202117.870911120@linutronix.de
---
arch/x86/entry/entry_64.S | 13 -------------
arch/x86/kernel/irq_64.c | 6 ++++++
2 files changed, 6 insertions(+), 13 deletions(-)

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 1597370..6b518be 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1145,19 +1145,6 @@ SYM_FUNC_START(asm_call_on_stack)
ret
SYM_FUNC_END(asm_call_on_stack)

-/* Call softirq on interrupt stack. Interrupts are off. */
-.pushsection .text, "ax"
-SYM_FUNC_START(do_softirq_own_stack)
- pushq %rbp
- mov %rsp, %rbp
- ENTER_IRQ_STACK regs=0 old_rsp=%r11
- call __do_softirq
- LEAVE_IRQ_STACK regs=0
- leaveq
- ret
-SYM_FUNC_END(do_softirq_own_stack)
-.popsection
-
#ifdef CONFIG_XEN_PV
/*
* A note on the "critical region" in our callback handler.
diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
index 12df3a4..d5f9df4 100644
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -20,6 +20,7 @@
#include <linux/sched/task_stack.h>

#include <asm/cpu_entry_area.h>
+#include <asm/irq_stack.h>
#include <asm/io_apic.h>
#include <asm/apic.h>

@@ -70,3 +71,8 @@ int irq_init_percpu_irqstack(unsigned int cpu)
return 0;
return map_irq_stack(cpu);
}
+
+void do_softirq_own_stack(void)
+{
+ run_on_irqstack_cond(__do_softirq, NULL, NULL);
+}
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